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288 Driving and Operating
will adjust the vehicle's speed
and attempt to maintain the
follow distance gap selected.
Press
[on the steering
wheel to adjust the following
gap. Each press cycles the gap
button through three settings:
Far, Medium, or Near.
When pressed, the current
gap setting displays briefly on
the instrument cluster and
HUD (if equipped). Subsequent
presses cycle the gap button
through three settings: Far,
Medium, or Near. The gap
setting will be maintained until
it is changed.
Since each gap setting
corresponds to a following
time (Far, Medium, or Near),
the following distance will vary
based on vehicle speed. The
faster the vehicle speed, the
further back your vehicle will
follow a vehicle detected
ahead. Consider traffic and
weather conditions when
selecting the following gap. The range of selectable gaps
may not be appropriate for all
drivers and driving conditions.
Changing the gap setting
automatically changes the
alert timing sensitivity (Far,
Medium, or Near) for the
Forward Collision Alert (FCA)
feature. See Forward Collision
Alert (FCA) System
0326.
Alerting the Driver
With Head-Up Display
Without Head-Up Display If ACC is engaged, driver
action may be required when
ACC cannot apply sufficient
braking because of
approaching a vehicle too
rapidly.
When this condition occurs,
the collision alert symbol will
flash on the windshield. Either
eight beeps will sound from
the front, or both sides of the
Safety Alert Seat will pulse
five times. Touch the Settings
icon on the infotainment home
page. Select
“Vehicle”to
display the list of available
options and select “Collision/
Detection Systems”.
See Defensive Driving 0240.
Approaching and Following a
Vehicle
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Driving and Operating 289
The vehicle ahead indicator is
in the instrument cluster and
HUD display (if equipped).
It only displays when a vehicle
is detected in your vehicle’s
path moving in the same
direction. If this symbol is not
displaying, ACC will not
respond to or brake for
vehicles ahead.
ACC automatically slows the
vehicle down and adjusts
vehicle speed to follow a
detected vehicle ahead at the
selected follow gap. The
vehicle speed increases or
decreases to follow a
detected vehicle in front of
your vehicle when that vehicle
is traveling slower than your
vehicle set speed. It may apply
limited braking, if necessary.
When braking is active, the
brake lamps will come on. The
automatic braking may feel or
sound different than if the
brakes were applied manually.
This is normal.Passing a Vehicle While
Using ACC
If the set speed is high
enough, and the left turn
signal is used to pass a vehicle
ahead in the selected
following gap, ACC may assist
by gradually accelerating the
vehicle prior to the lane
change.
{Warning
When using ACC to pass a
vehicle or perform a lane
change, the following
distance to the vehicle being
passed may be reduced.
ACC may not apply
sufficient acceleration or
braking when passing a
vehicle or performing a lane
change. Always be ready to
manually accelerate or brake
to complete the pass or lane
change.
Stationary or Very
Slow-Moving Objects
{Warning
ACC may not detect and
react to stopped or
slow-moving vehicles ahead
of you. For example, the
system may not brake for a
vehicle it has never detected
moving. This can occur in
stop-and-go traffic or when
a vehicle suddenly appears
due to a vehicle ahead
changing lanes. Your vehicle
may not stop and could
cause a crash. Use caution
when using ACC. Your
complete attention is always
required while driving and
you should be ready to take
action and apply the brakes.
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290 Driving and Operating
Irregular Objects
Affecting ACC
ACC may have difficulty
detecting the following
objects:
.Vehicles with cargo
extending from the back end.
.Non-standard shaped
vehicles, such as vehicle
transport, vehicles with a
side car fitted, or horse
carriages.
.Objects that are close to the
front of your vehicle.
ACC Automatically
Disengages
ACC may automatically
disengage and the driver will
need to manually apply the
brakes to slow the
vehicle when:
.The sensors are blocked.
.The Traction Control System
(TCS) or StabiliTrak/ESC has
activated or been disabled.
.There is a fault in the
system.
.The radar falsely reports
blockage when driving in a
desert or remote area with
no other vehicles or
roadside objects. A DIC
message may display to
indicate that ACC is
temporarily unavailable.
.A DIC message may display
to indicate that ACC is
temporarily unavailable.
The ACC active symbol will
turn white when ACC is no
longer active.
In some cases, when ACC will
not activate, regular cruise
control may be used. See
“Switching Between ACC and
Regular Cruise Control”
previously in this section.
Always consider driving
conditions before using either
cruise control system. Notification to Resume ACC
ACC will maintain a following
gap behind a detected vehicle
and slow your vehicle to a
stop behind that vehicle.
If the stopped vehicle ahead
has driven away and ACC has
not resumed, the vehicle
ahead indicator will flash as a
reminder to check traffic
ahead before proceeding. In
addition, the left and right
sides of the Safety Alert Seat
will pulse three times, or three
beeps will sound. Touch the
Settings icon on the
infotainment home page.
Select
“Vehicle” to display the
list of available options and
select ”Alert Type” and
“Adaptive Cruise Go Notifier”
in “Collision/Detection
Systems”.
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When the vehicle ahead drives
away, ACC resumes
automatically if the stop was
brief. If necessary, press RES+
or the accelerator pedal to
resume ACC. If stopped for
more than two minutes or if
the driver door is opened and
the driver seat belt is
unbuckled, ACC automatically
applies the Electric Parking
Brake (EPB) to hold the
vehicle. The Electric Parking
Brake light will turn on. See
Electric Parking Brake0274.
To release the EPB, press the
accelerator pedal.
A DIC warning message may
display indicating to shift to
P (Park) before exiting the
vehicle. See Vehicle Messages
0 151.{Warning
If ACC has stopped the
vehicle, and if ACC is
disengaged, turned off,
or canceled, the vehicle will
no longer be held at a stop.
The vehicle can move. When
ACC is holding the vehicle at
a stop, always be prepared
to manually apply the
brakes.
{Warning
Leaving the vehicle without
placing it in P (Park) can be
dangerous. Do not leave the
vehicle while it is being held
at a stop by ACC. Always
place the vehicle in P (Park)
and turn off the ignition
before leaving the vehicle. ACC Override
If using the accelerator pedal
while ACC is active, the ACC
indicator turns blue on the
instrument cluster and in the
HUD (if equipped) indicating
ACC braking will not occur.
ACC will resume operation
when the accelerator pedal is
not being pressed.
{Warning
The ACC will not
automatically apply the
brakes if your foot is resting
on the accelerator pedal.
You could crash into a
vehicle ahead of you.
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292 Driving and Operating
Curves in the Road
{Warning
On curves, ACC may not
detect a vehicle ahead in
your lane. You could be
startled if the vehicle
accelerates up to the set
speed, especially when
following a vehicle exiting or
entering exit ramps. You
could lose control of the
vehicle or crash. Do not use
ACC while driving on an
entrance or exit ramp.
Always be ready to use the
brakes if necessary.
{Warning
On curves, ACC may
respond to a vehicle in
another lane, or may not
have time to react to a
vehicle in your lane. You
could crash into a vehicle
ahead of you, or lose control(Continued)
Warning (Continued)
of your vehicle. Give extra
attention in curves and be
ready to use the brakes if
necessary. Select an
appropriate speed while
driving in curves.
ACC may operate differently
in a sharp curve. It may reduce
the vehicle speed if the curve
is too sharp.
If equipped, the curve speed
control indicator
bmay
illuminate green when ACC is
actively controlling the vehicle
speed and detects a sharp
curve on the road ahead.
ACC automatically slows the
vehicle down while navigating
the curve and may increase
speed out of the curve, but will
not exceed the set speed.
When following a vehicle and
entering a curve, ACC may not
detect the vehicle ahead and
accelerate to the set speed.
When this happens, the
vehicle ahead indicator will not
appear.
ACC may detect a vehicle that
is not in your lane and apply
the brakes.
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Driving and Operating 293
ACC may occasionally provide
an alert and/or braking that is
considered unnecessary.
It could respond to vehicles in
different lanes, signs,
guardrails, and other
stationary objects when
entering or exiting a curve.
This is normal operation. The
vehicle does not need service.
Other Vehicle Lane Changes
ACC will not detect a vehicle
ahead until it is completely in
the lane. The brakes may need
to be manually applied.Objects Not Directly in Front
of Your Vehicle
The detection of objects in
front of the vehicle may not be
possible if:
.The vehicle or object ahead
is not within your lane.
.The vehicle ahead is shifted,
not centered, or is shifted to
one side of the lane.
Driving in Narrow Lanes
Vehicles in adjacent traffic
lanes or roadside objects may
be incorrectly detected when
located along the roadway.
Do Not Use ACC on Hills
Do not use ACC when driving
on steep hills as ACC may not
detect a vehicle ahead.
Do Not Use ACC When
Towing a Trailer
ACC should not be used when
towing a trailer.
Disengaging ACC
There are three ways to
disengage ACC:
.Step lightly on the brake
pedal.
.Press*.
.Presso.
Erasing Speed Memory
The cruise control set speed is
erased from memory if
ois
pressed or if the ignition is
turned off.
Weather Conditions
Affecting ACC
System operation may be
limited under snow, heavy rain,
or road spray conditions.
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294 Driving and Operating
Accessory Installations and
Vehicle Modifications
Do not install or place any
object around the front
camera windshield area that
would obstruct the front
camera view.
Do not install objects on top of
the vehicle that overhang and
obstruct the front camera,
such as a canoe, kayak,
or other items that can be
transported on a roof rack
system. See Roof Rack
System0114.
Do not modify the hood,
headlamps, or fog lamps, as
this may limit the camera’s
ability to detect an object.
Cleaning the Sensing System
The camera sensor on the
windshield behind the
rearview mirror can become
blocked by snow, ice, dirt, mud,
or debris. This area needs to
be cleaned for ACC to operate
properly. The vehicle headlamps may
need to be cleaned due to dirt,
snow, or ice. Objects that are
not illuminated correctly may
be difficult to detect.
If ACC will not operate, regular
cruise control may be
available. See
“Switching
Between ACC and Regular
Cruise Control” previously in
this section. Always consider
driving conditions before using
either cruise control system.
For cleaning instructions, see
“Washing the Vehicle” under
Exterior Care 0440.
Super Cruise
If equipped, Super Cruise can
steer to maintain lane position
under certain conditions on
compatible highways that are
separated from opposing
traffic.
{Warning
Super Cruise can only assist
to maintain lane position
when driving on compatible
highways. You must
supervise the driving task
and monitor the freeway
conditions. You may need to
respond to traffic events by
steering, braking,
or accelerating. See
Defensive Driving 0240.
Super Cruise is:
.Not a self-driving system.
.Not a crash avoidance or
warning system.
.Not a substitute for
proper supervision of the
driving task.
Super Cruise uses the
following to detect the current
lane position and lane
markings ahead on compatible
highways under certain
conditions:
.Cameras
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Driving and Operating 295
.Global Positioning System
(GPS) sensing
.A high-precision map
.GPS-enhancement data
downloaded through OnStar
Super Cruise works with
Adaptive Cruise Control (ACC),
which controls acceleration
and braking while Super
Cruise is enabled and
operating. Review and
understand both this section
and the ACC section before
using Super Cruise. See
Adaptive Cruise Control
(Advanced) 0283.
An active OnStar or
connected service plan that
includes Emergency Services
is required to use Super
Cruise.
{Warning
Super Cruise does not
perform all aspects of
driving, nor does it do
everything a driver can do. (Continued)
Warning (Continued)
Super Cruise only steers to
maintain lane position. Super
Cruise can only be used with
Adaptive Cruise Control.
Super Cruise does:
.Not prevent crashes or
warn of possible crashes.
.Not steer to avoid
stopped or slow-moving
vehicles, construction
barriers or cones,
motorcycles, children,
pedestrians, animals,
or other objects on the
freeway.
.Not steer in response to
vehicles or objects next to
your vehicle, including
vehicles attempting to
enter your lane.
.Not respond to traffic
lights, stop signs, or other
traffic control devices.
.Not change lanes.(Continued)
Warning (Continued)
.Not make turns.
.Not steer to merge onto
or to exit freeways.
.Not detect, steer to avoid,
or steer through
construction zones.
.Not function on surface
streets.
.Not respond to crossing
or oncoming traffic.
.Not function in city driving
conditions.
{Warning
Some state and local laws
may require hands to be
kept on the steering wheel
at all times. Only remove
your hands from the
steering wheel if Super
Cruise is engaged, it is safe
to do so, and it is permitted
by state and local laws.
(Continued)